2004.08.20 08:56 "Re: [Tiff] Tiff conversion using libtiff", by Joris Van Damme
Here is a section of the code in the tiff2pdf.c file that checks when the PhotometricIntepretation field is RGB that the number of samples is 3, for Red, Green, and Blue:
Presumably, PhotometricInterpretation = RGB and SamplesPerPixel = 1 could even be a valid combination, if and only if the Indexed tag is also present. See
I must admit I have never seen such 'Indexed' image in the wild, so I'm looking forward to a tiffinfo or whatever tag dump. Note that it might not be a good idea to fool LibTiff into thinking PhotometricInterpretation = Palette without checking for presence of Indexed first.
Hey I've been developing Yet Another TIFF Tag Viewer
I've noticed that on Joris' web page there are still yet a few private tags that I did not know of, see http://www.awaresystems.be/imaging/tiff/tifftags.html.
Likewise, your list contains a lot that I didn't yet have any data on.
And thanks for the pointer. Indeed, since yesterday, a 'TIFF Tag Reference' is on-line. Anyone with remarks, thoughts, wishes, or willing to submit specifications on private tags, should contact me at email@example.com.
Have a nice day,
Joris Van Damme
Download your free TIFF tag viewer for windows here: